Author Question: Each hemoglobin molecule contains A) four alpha chains. B) one alpha and one beta chain. C) four ... (Read 72 times)

cherise1989 · **on:** Feb 27, 2019

Each hemoglobin molecule contains
A) four alpha chains.
B) one alpha and one beta chain.
C) four iron atoms.
D) one heme group.
E) a molecule of oxygen and a molecule of carbon dioxide.

Question 2

When the temperature of the preoptic area of the hypothalamus exceeds its thermostat setting,
A) peripheral vasoconstriction occurs.
B) skin blood flow increases.
C) rate and depth of respiration decreases.
D) sweat glands are inhibited.
E) blood is shunted to deep veins.